This is one of those "why didn't i think of that!" products. My 3 year old loves her Nesquik Chocolate milk but she always spills it. First thing we did after this arrived was drive to Wawa and buy her a chocolate milk. This fit perfectly upside down inside the neck. The straw fit snuggly and she was able to enjoy her milk without me worrying that she was going to spill it. Great product! I'll be buying more.